Installation

Once Composer has installed or updated your packages you need to register
LaravelODBC and the package it uses (extradb) with Laravel itself.
Open up app/config/app.php and
find the providers key towards the bottom.

Add the following to the list of providers:

'jtgrimes\Laravelodbc\ODBCServiceProvider'

You won't need to add anything to the aliases section.

Configuration

There is no separate package configuration file for LaravelODBC. You'll just add a new array to the connections array in app/config/database.php.

The ODBC driver is different from the pre-installed ones in that you're going to pass in the DSN instead of having Laravel build it for you. There are just too many ways to configure an ODBC database for this package to do it for you.
Some sample configurations are at php.net.